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Condensed Consolidated Statements of Stockholders' Equity (Unaudited) - USD ($) shares in Thousands, $ in Thousands | Total | COMMON STOCK | CAPITAL SURPLUS | ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) | RETAINED EARNINGS
--- | --- | --- | --- | --- | ---
Balance at beginning of period (in shares) at Dec. 31, 2017 |  | 124,261 |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |
Net issuances of restricted stock (in shares) |  | 523 |  |  |
Repurchases of common stock (in shares) |  | (3,409) |  |  |
Balance at end of period (in shares) at Sep. 30, 2018 |  | 121,375 |  |  |
Balance at beginning of period at Dec. 31, 2017 |  | $ 124 | $ 1,064,601 | $ 3,507 | $ 37,033
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |
Net issuances of restricted stock |  | 1 | (1) |  |
Repurchases of common stock |  | (4) |  |  | (223,440)
Stock-based compensation expense |  |  | 33,000 |  |
Foreign currency translation adjustments, net of tax | $ (13,299) |  |  | (13,299) |
Net income | 320,724 |  |  |  | 320,724
Cash dividends ($.31 per share, $.28 per share, $.93 per share, and $.84 per share) |  |  |  |  | (103,004)
Balance at end of period at Sep. 30, 2018 |  | $ 121 | 1,097,600 | (9,792) | 31,313
Balance at beginning of period (in shares) at Jun. 30, 2018 |  | 122,445 |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |
Net issuances of restricted stock (in shares) |  | (2) |  |  |
Repurchases of common stock (in shares) |  | (1,068) |  |  |
Balance at end of period (in shares) at Sep. 30, 2018 |  | 121,375 |  |  |
Balance at beginning of period at Jun. 30, 2018 |  | $ 122 | 1,086,545 | (6,409) | 29,240
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |
Net issuances of restricted stock |  | 0 | 0 |  |
Repurchases of common stock |  | (1) |  |  | (78,958)
Stock-based compensation expense |  |  | 11,055 |  |
Foreign currency translation adjustments, net of tax | (3,383) |  |  | (3,383) |
Net income | 115,242 |  |  |  | 115,242
Cash dividends ($.31 per share, $.28 per share, $.93 per share, and $.84 per share) |  |  |  |  | (34,211)
Balance at end of period at Sep. 30, 2018 |  | $ 121 | 1,097,600 | (9,792) | 31,313
Balance at beginning of period (in shares) at Dec. 31, 2018 |  | 119,078 |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |
Net issuances of restricted stock (in shares) |  | 549 |  |  |
Repurchases of common stock (in shares) |  | (3,530) |  |  |
Balance at end of period (in shares) at Sep. 30, 2019 |  | 116,097 |  |  |
Balance at beginning of period at Dec. 31, 2018 | 1,063,198 | $ 119 | 1,079,188 | (16,109) | 0
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |
Net issuances of restricted stock |  | 1 | (1) |  |
Repurchases of common stock |  | (4) |  |  | (208,166)
Stock-based compensation expense |  |  | 34,803 |  |
Foreign currency translation adjustments, net of tax | (9,762) |  |  | (9,762) |
Net income | 341,591 |  |  |  | 341,591
Cash dividends ($.31 per share, $.28 per share, $.93 per share, and $.84 per share) |  |  |  |  | (109,830)
Balance at end of period at Sep. 30, 2019 | 1,111,830 | $ 116 | 1,113,990 | (25,871) | 23,595
Balance at beginning of period (in shares) at Jun. 30, 2019 |  | 117,561 |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |
Net issuances of restricted stock (in shares) |  | (3) |  |  |
Repurchases of common stock (in shares) |  | (1,461) |  |  |
Balance at end of period (in shares) at Sep. 30, 2019 |  | 116,097 |  |  |
Balance at beginning of period at Jun. 30, 2019 |  | $ 118 | 1,102,101 | (15,860) | 22,868
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |
Net issuances of restricted stock |  | 0 | 0 |  |
Repurchases of common stock |  | (2) |  |  | (80,219)
Stock-based compensation expense |  |  | 11,889 |  |
Foreign currency translation adjustments, net of tax | (10,011) |  |  | (10,011) |
Net income | 117,181 |  |  |  | 117,181
Cash dividends ($.31 per share, $.28 per share, $.93 per share, and $.84 per share) |  |  |  |  | (36,235)
Balance at end of period at Sep. 30, 2019 | $ 1,111,830 | $ 116 | $ 1,113,990 | $ (25,871) | $ 23,595

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